SN75155D

As one of the essential components in telecommunications, interface circuits are necessary for signal transmission and processing. SN75155D is a TTL compatible transceiver designed specifically for these interface applications. This article will explain the application field of SN75155D and its working principle.

What Is Interface

Interface cells are components used to connect and transmit data between two or more systems or devices. They allow digital signals to be transferred between devices over the same network or wire. It is the basic foundation of information transmission. Generally, there are three types of interface cells: drivers, receivers, and transceivers.

SN75155D Application Field

SN75155D is a driver-receiver/transceiver manufactured by Texas Instruments. It is compatible with TTL logic level (5V equivalent to logic “1”, 0V equivalent to logic “0”) but is optimized for driving and receiving line receivers. This driver-receiver can replace the 74LS04 Hex Inverter and 74LS06 Hex Inverter Buffer, which require 6 and 10 operations respectively, but SN75155D can be used in their places since it takes only 4 symbols to operate.

As for the application, SN75155D is mainly used for system logic and input/output buffering. It can also be used in interface circuits, to connect two systems with different logic control values. In addition, it can be used to buffer power amplifiers in audio and video systems, as well as in digital force transfer circuits, and other applications.

SN75155D Working Principles

SN75155D uses the differential output technology, which uses the combined action of two complementary transistors to send out one logic signal level. Generally, it consists of two parts: an output buffer amplifier and a logic inverter. When the input logic is “high”, the output of the buffer amplifier is “low”, and the output of the logic inverter is “high”; when the input logic is “low”, the output of the buffer amplifier is “high”, and the output of the logic inverter is “low”. By controlling the two transistors, the differential output can operate different logic levels, achieving effective data exchange between two systems.

Conclusion

SN75155D is a transceiver that is mainly used for interface applications. It uses the differential output technology to control two transistors, allowing for effective data exchange between two systems. It is also versatile in its application as it can be used in force transfer circuits, digital audio and video systems, as well as system logic and input/output buffering.